DL 532 then DL 5123 at JFK
Denver → New York → Jacksonville
Timetable, New York time
18:30DL 532 from Denver at the gate
18:20DL 5123 to Jacksonville leaves the gate
23 h 50 apart on the timetable, overnight
DL 5123 leaves 23 h 50 after DL 532 arrives on the timetable: more than half a day, so not a connection we count.